By default, Sygate Personal Firewall will block inbound Internet Control Message Protocol (ICMP) echo-reply message known as PING. For the last week voice in yahoo messenger can not be activated. My sygate firewall log shows that ICMP 220.127.116.11 is being blocked on port 13. 18.104.22.168 is traced backed to OrgName: Performance Systems International Inc. OrgID: PSI Address: 1015 31st St NW City: Washington StateProv: DC PostalCode: 20007 Country: US NetRange: 22.214.171.124 - 126.96.36.199 My isp compamy uses Telus. Signed up with another isp company and this does not happen. No problems in yahoo messenger with the new isp and no ICMP from 188.8.131.52. Would like to stay with the old isp because of emails. Sygate by advanced rule can be configured to allow all icmp traffic but prefer not doing this. Any suggestions would be appreciated and also would like to know why this is happening. Thanks in advance for your help.